Weekly Digest Feb. 21, 2014

Bullet Galaxies and Dark Matter In this talk, Marusa Bradac will discuss how astronomers observe the invisible matter in one of the true gems on the sky: a giant cluster of galaxies also called the Bullet Cluster.

Martian dune field In this image of a Martian dune field in a large crater, the dunes give the impression of flying in a "V" formation. The spacing of individual dunes is a function of sand supply, wind speed, and topography.

United Nations Takes Aim at Asteroid Threat to Earth As the anniversary of last year's surprise Russian meteor explosion nears, a United Nations action team is taking steps to thwart dangerous space rocks, including setting up a warning network and a planning advisory group that would coordinate a counterpunch to cosmic threats

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